Oldsmobile Big Block V8 Dual Plane Air Gap Aluminum Intake Manifold - Polished

• Compatible with Oldsmobile big block V8 engines

• Composed of heat dissipating 6061-T6 aluminum

• Dual plane air gap design improves airflow and performance

TSP's dual-plane air gap intake manifold for the Big Block Oldsmobile V8 is ideal for high-performance applications. Its improved design is complimented by an open area under the plenum. This feature ensures less heat transfer from the engine, meaning the air/fuel charge will be cooler and produce more power and torque. Producing power and torque comparable to single-plane manifolds, it improves drivability and throttle response like other dual-planes and performs best between 1,500 and 6,500 rpm. It is cast from lightweight aluminum and features a relatively low profile for great hood clearance.

What engines is this intake manifold compatible with?
This intake manifold is designed for Oldsmobile Big Block V8 applications, including 400 in3, 425 in3, 455 in3.

Will this intake fit common Oldsmobile big block engines?
Yes, this intake fits Oldsmobile big block combinations including 400, 425, and 455 engines.

What type of carburetor does this intake support?
This intake uses a 4150 square bore carburetor flange and is built for single 4-barrel carbureted applications.

What RPM range is this intake designed for?
This dual plane intake is designed to perform from 1,500-6,500 RPM, making it a strong choice for performance street and street/strip use.

What is the benefit of an air gap intake design?
The air gap design creates an open space under the plenum to reduce heat transfer from the engine, helping keep the air/fuel charge cooler for improved power and torque.

How does this compare to a standard dual-plane intake?
Compared to a standard dual-plane intake, this air gap design offers improved mid-range and top-end performance while still maintaining good throttle response and street manners.

What type of intake manifold is this?
This is a dual plane aluminum intake manifold with an air gap design, built to improve low-end and mid-range performance while maintaining good drivability.

Will this intake clear a stock hood?
It features a relatively low-profile design to help with hood clearance, with a front height of 5.040 in., center height of 5.540 in., rear height of 6.040 in..

What material is this intake made from?
It is cast from lightweight aluminum, which helps reduce weight and improve heat dissipation.

Is this a direct bolt-on intake manifold?
In most cases, this intake is designed as a direct-fit manifold for compatible Oldsmobile Big Block V8 applications, though proper gaskets, carburetor setup, and supporting components are still recommended during installation.

What additional parts may be needed for installation?
Depending on your combination, you may need intake gaskets, carburetor linkage adjustments, and other supporting hardware during installation.

Will this intake improve throttle response on my Oldsmobile Big Block?
Yes, the manifold design helps improve airflow and mixture distribution, which can translate to better throttle response and more consistent power delivery.

Is this a good upgrade from a stock intake?
Yes, this intake is a solid upgrade for compatible Oldsmobile Big Block V8 builds that need improved airflow, better drivability, and stronger performance across the usable RPM range.

Does the polished finish affect performance?
No, the polished finish is cosmetic and does not change performance—it gives the intake a bright, show-quality appearance.

How do I maintain the polished finish?
Regular cleaning and occasional polishing will help maintain the shine and reduce surface oxidation over time.